what is the probability that a coin tossed in the air will land heads up?\n25%\n50%\n75%\n100%

Explanation:

Step1: Identify total outcomes

A coin has 2 sides (heads and tails), so total outcomes $n(S)=2$.

Step2: Identify favorable outcomes

Getting heads is 1 outcome, so favorable outcomes $n(E) = 1$.

Step3: Calculate probability

The probability formula is $P(E)=\frac{n(E)}{n(S)}$. Substituting values, we get $P(E)=\frac{1}{2}=0.5$ or 50%.

Answer:

50%